@charset "utf-8";
/**
 * 赛润电气（杭州）有限公司 - PC 端样式
 * 仿自 www.sairundianqi.cn
 */

/* ==================== 基础重置 ==================== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: Tahoma, "Source Han Sans", "Microsoft YaHei", "PingFang SC", sans-serif;
    font-size: 14px;
    color: #656d78;
    background: #fff;
    overflow-x: hidden;
}
ul, ol { list-style: none; }
img { border: 0; vertical-align: middle; max-width: 100%; }
a { text-decoration: none; color: inherit; transition: color .2s; }
table { border-collapse: collapse; border-spacing: 0; }
input, textarea, button { font-family: inherit; font-size: inherit; outline: none; }

/* ==================== 通用布局 ==================== */
.container { width: 1200px; margin: 0 auto; }
/* 公司简介区：原站该区块比常规容器更宽（左边界对齐，向右延伸） */
.container.wide { width: 1476px; margin-left: calc(50% - 600px); margin-right: 0; }
.clearfix::after { content: ''; display: table; clear: both; }

/* ==================== 顶部 header ==================== */
.header {
    height: 101px;
    background: #fff;
    position: relative;
    z-index: 100;
}
.header .container {
    height: 101px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.header .logo { display: block; width: 280px; }
.header .logo img { width: 280px; height: 75px; }

/* 主导航 */
.nav { }
.nav ul { display: flex; height: 55px; }
.nav li { position: relative; width: 121px; height: 55px; line-height: 55px; }
.nav li a {
    display: block;
    height: 55px;
    text-align: center;
    color: #383838;
    font-weight: bold;
    font-size: 16px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.nav li a:hover,
.nav li.active a { color: #253d99; }

/* ==================== Banner 轮播 ==================== */
.banner { position: relative; height: 600px; overflow: hidden; }
.banner .slide-item {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 600px;
    background-position: 50% 50%;
    background-repeat: no-repeat;
    background-size: cover;
    opacity: 0;
    transition: opacity .6s;
}
.banner .slide-item.on { opacity: 1; }
.banner .slide-item a { display: block; width: 100%; height: 600px; }

/* 轮播箭头 */
.banner .slide-arrow {
    position: absolute;
    top: 50%;
    margin-top: -30px;
    width: 40px; height: 60px;
    background: rgba(0,0,0,.25);
    color: #fff;
    font-size: 28px;
    line-height: 60px;
    text-align: center;
    cursor: pointer;
    z-index: 10;
    user-select: none;
    opacity: 0;
    transition: opacity .3s;
}
.banner:hover .slide-arrow { opacity: 1; }
.banner .slide-prev { left: 0; }
.banner .slide-next { right: 0; }

/* 轮播指示点 */
.banner .slide-dots {
    position: absolute;
    bottom: 20px;
    left: 0;
    width: 100%;
    text-align: center;
    z-index: 10;
}
.banner .slide-dots span {
    display: inline-block;
    width: 10px; height: 10px;
    margin: 0 5px;
    border-radius: 50%;
    background: rgba(255,255,255,.5);
    cursor: pointer;
    transition: background .3s;
}
.banner .slide-dots span.on { background: #fff; }

/* ==================== 通用区块标题 ==================== */
.section { padding: 64px 0 60px; position: relative; }
.section-title { text-align: center; position: relative; margin-bottom: 106px; }
.section-title.left { text-align: left; }
.section-title.left::after { margin-left: 0; }
.section-title h2 {
    font-size: 40px;
    font-weight: 700;
    color: #253d99;
    line-height: 40px;
}
.section-title .en {
    display: block;
    margin-top: 8px;
    font-size: 16px;
    color: #999;
    text-transform: uppercase;
    letter-spacing: 2px;
}
.section-title::after {
    content: '';
    display: block;
    width: 40px; height: 2px;
    background: #253d99;
    margin: 15px auto 0;
}
/* 背景大字水印 */
.section .watermark {
    position: absolute;
    top: 40px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 60px;
    font-weight: bold;
    color: #f5f5f5;
    white-space: nowrap;
    letter-spacing: 3px;
    z-index: 0;
    pointer-events: none;
    user-select: none;
}
.section .container { position: relative; z-index: 1; }

.section.gray { background: #f3f3f3; }

/* ==================== 产品区（首页） ==================== */
.product-box { display: flex; padding-left: 28px; }

/* 产品分类侧栏（内页固定高度，原站实测 494px/8条=62px；首页单独加高见 .side-tall） */
.product-side { width: 245px; flex-shrink: 0; }
.product-side .side-head {
    width: 300px;
    height: 100px;
    margin-left: -27px;
    flex-shrink: 0;
    background: #253d99;
    color: #fff;
    text-align: center;
    padding-top: 20px;
}
.product-side .side-head h3 {
    font-size: 30px;
    font-weight: bold;
    line-height: 1.2;
}
.product-side .side-head span { display: block; font-size: 16px; color: #aaaaaa; margin-top: 4px; }
.product-side ul { display: flex; flex-direction: column; background: transparent; }
.product-side li { display: flex; border-bottom: 1px dashed #cccccc; }
.product-side li:last-child { border-bottom: 0; }
.product-side li a {
    flex: 1;
    display: flex;
    align-items: center;
    height: 62px;
    padding: 0 12px;
    font-family: Tahoma, "Source Han Sans", "Microsoft YaHei", sans-serif;
    font-size: 18px;
    font-weight: bold;
    color: #444444;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.product-side li a:hover { background: #253d99; color: #fff; font-weight: 400; }
/* 首页侧栏：原站实测 848px / 8 条 = 106px */
.side-tall .product-side li a { height: 106px; }
/* 首页侧栏整体上移 29px（原站实测蓝色块 y=899） */
.side-tall .product-side { margin-top: -29px; }

/* 产品列表网格 */
.product-main { flex: 0 0 858px; width: 858px; margin-left: 51px; }
/* 详情页内容区（原站尺寸与列表页不同） */
.product-main.pd-main { flex: 0 0 885px; width: 885px; margin-left: 40px; }
.product-grid { display: flex; flex-wrap: wrap; gap: 22px 15px; }
.product-grid::after { content: ''; }

/* 3列网格 */
.product-grid.col3 .product-item { width: 276px; }
/* 2列网格 */
.product-grid.col2 .product-item { width: calc((100% - 20px) / 2); }

.product-item {
    border: 1px solid #eee;
    background: #fff;
    text-align: center;
    transition: box-shadow .3s, transform .3s;
}
.product-item:hover { box-shadow: 0 4px 20px rgba(0,0,0,.1); transform: translateY(-3px); }
.product-item .pic {
    display: block;
    height: 210px;
    padding: 15px;
}
.product-item .pic img {
    width: 100%; height: 100%;
    object-fit: contain;
}
.product-item .name {
    display: block;
    height: 43px;
    line-height: 43px;
    padding: 0 10px;
    font-size: 14px;
    color: #656d78;
    border-top: 1px solid #f0f0f0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.product-item:hover .name { color: #253d99; }

/* 首页主推产品（大图+按钮） */
.product-feature {
    border: 1px solid #eee;
    padding: 20px;
    display: flex;
    gap: 25px;
    align-items: center;
    margin-bottom: 20px;
}
.product-feature .pic { width: 300px; flex-shrink: 0; height: 215px; }
.product-feature .pic img { width: 100%; height: 100%; object-fit: contain; }
.product-feature .info { flex: 1; min-width: 0; }
.product-feature .info h3 { font-size: 18px; color: #333; font-weight: normal; margin-bottom: 18px; }
.product-feature .btns { display: flex; gap: 15px; }

/* 通用按钮 */
.btn {
    display: inline-block;
    height: 38px;
    line-height: 38px;
    padding: 0 26px;
    font-size: 14px;
    color: #fff;
    background: #253d99;
    text-align: center;
    transition: opacity .3s;
}
.btn:hover { opacity: .85; color: #fff; }
.btn.gray-btn { background: #888; }
.btn.red { background: #e23a2a; }

/* ==================== 公司简介（首页） ==================== */
.about-box { display: flex; align-items: flex-start; }
.about-box .txt { width: 638px; flex-shrink: 0; padding-top: 77px; }
.about-box .txt .section-title { margin-bottom: 72px; }
.about-box .txt h3 { font-size: 26px; color: #333; font-weight: normal; margin-bottom: 20px; }
.about-box .txt p { width: 550px; font-size: 14px; line-height: 30px; color: #656d78; text-indent: 2em; }
.about-box .txt .btns { display: flex; gap: 15px; margin-top: 25px; }
.about-box .pic { width: 903px; flex-shrink: 0; margin-left: -65px; }
.about-box .pic img { width: 100%; height: 547px; object-fit: cover; display: block; }
/* 公司简介区块：背景区从图片顶部开始（原站实测图片 y=1959） */
.about-section { padding-top: 12px; }
.about-section .section-title::after { margin-left: 0; }

/* ==================== 成功案例（首页） ==================== */
.case-list { position: relative; }
.case-view { overflow: hidden; }
.case-list .case-track { display: flex; gap: 20px; transition: transform .4s; }
.case-list .case-item { flex: 0 0 386px; width: 386px; background: #fff; text-align: center; }
/* 左右切换箭头（原站 x=332 / 1565，垂直居中） */
.case-arrow {
    position: absolute;
    top: 50%;
    margin-top: -12px;
    width: 24px;
    height: 24px;
    line-height: 24px;
    text-align: center;
    font-size: 20px;
    color: #999;
    cursor: pointer;
    user-select: none;
    z-index: 2;
}
.case-arrow:hover { color: #253d99; }
.case-prev { left: -28px; }
.case-next { right: -29px; }
.case-list .case-item .pic {
    display: block;
    height: 310px;
    background: #eef3fa;
    padding: 15px 0;
}
.case-list .case-item .pic img { width: 100%; height: 100%; object-fit: contain; }
.case-list .case-item .name {
    display: block;
    height: 50px;
    line-height: 50px;
    font-size: 14px;
    color: #656d78;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding: 0 10px;
}
.case-list .case-item:hover .name { color: #253d99; }

.case-more { text-align: center; margin-top: 35px; display: flex; justify-content: center; gap: 15px; }

/* ==================== 蓝色条幅 ==================== */
.blue-bar { background: #253d99; color: #fff; padding: 45px 0; }
/* 内容整体比常规容器左移 53px、标题区固定 557px（原站实测） */
.blue-bar .container { width: 958px; margin-left: calc(50% - 653px); margin-right: 0; display: flex; align-items: flex-start; }
.blue-bar .pic { width: 295px; flex-shrink: 0; margin-top: 20px; }
.blue-bar .pic img { width: 100%; display: block; }
.blue-bar .txt { width: 557px; flex-shrink: 0; margin-left: 105px; margin-top: 40px; }
.blue-bar .txt h3 { font-size: 26px; font-weight: normal; line-height: 1.5; }
.blue-bar .features { display: flex; margin-top: 34px; }
.blue-bar .features li { display: flex; align-items: center; gap: 8px; font-size: 15px; color: #cdd7f0; margin-right: 27px; }
.blue-bar .features li img { width: 21px; height: 21px; }

/* ==================== 新闻动态（首页） ==================== */
.news-box { display: flex; justify-content: flex-end; gap: 33px; }
.news-box .pic { width: 538px; flex-shrink: 0; }
.news-box .pic img { width: 100%; display: block; }
.news-box .list { width: 594px; flex-shrink: 0; }
.news-box .list li { border-bottom: 1px solid #eee; padding: 12px 0; }
.news-box .list li:first-child { padding-top: 0; }
.news-box .list li a { display: block; }
.news-box .list li h4 {
    font-size: 16px;
    font-weight: normal;
    color: #333;
    margin-bottom: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.news-box .list li:hover h4 { color: #253d99; }
.news-box .list li .desc {
    font-size: 13px;
    color: #999;
    line-height: 22px;
    height: 44px;
    overflow: hidden;
    margin-bottom: 8px;
}
.news-box .list li .meta { font-size: 12px; color: #bbb; display: flex; justify-content: space-between; }

/* ==================== 内页通用 ==================== */
/* 面包屑（尺寸/配色取自原站） */
.crumb { height: 54px; border-bottom: 1px solid #e5e5e5; }
.crumb .container { height: 54px; display: flex; align-items: center; }
.crumb-bar {
    width: 5px;
    height: 21px;
    background: #0a6cb0;
    flex-shrink: 0;
}
.crumb .pos-label {
    font-size: 16px;
    color: #656d78;
    margin-left: 10px;
    white-space: nowrap;
}
.crumb-nav { white-space: nowrap; }
.crumb-nav a {
    font-family: Tahoma;
    font-size: 14px;
    line-height: 34px;
    color: #666;
    text-decoration: none;
}
.crumb-nav a:hover { color: #48b6f8; }
.crumb-nav a:last-of-type { color: #999; }
.crumb-sep {
    font-style: normal;
    font-size: 14px;
    color: #666;
    margin: 0 12px;
}

/* 内页标题 */
.page-title { text-align: center; padding: 60px 0 34px; position: relative; }
.page-title h2 { font-size: 30px; font-weight: normal; color: #333; }
.page-title::after {
    content: '';
    display: block;
    width: 40px; height: 2px;
    background: #253d99;
    margin: 18px auto 0;
}

/* 内页主体 */
.page-body { padding-bottom: 60px; }
.page-body.pd-page { padding-bottom: 20px; }
.page-body.pt-products { padding-top: 60px; }
.page-body.pt-news { padding-top: 77px; }
.page-body.pt-honor { padding-top: 32px; }
.page-body.pt-contact { padding-top: 0; }

/* 关于我们 正文 */
.article { font-size: 14px; line-height: 32px; color: #656d78; }
.article h3 { font-size: 20px; color: #253d99; font-weight: normal; margin: 25px 0 15px; }
.article p { text-indent: 2em; margin-bottom: 15px; }
.article img { max-width: 100%; height: auto; }

/* ==================== 分页 ==================== */
.pagination { text-align: center; padding: 22px 0 8px; }
.pagination a, .pagination span {
    display: inline-block;
    min-width: 36px;
    height: 36px;
    line-height: 34px;
    padding: 0 10px;
    margin: 0 4px;
    border: 1px solid #ddd;
    background: #fff;
    color: #656d78;
    font-size: 14px;
    text-align: center;
    transition: all .3s;
}
.pagination a:hover { border-color: #253d99; color: #253d99; }
.pagination .page-num-current { background: #253d99; border-color: #253d99; color: #fff; }

/* ==================== 新闻列表页 ==================== */
.news-list li { border-bottom: 1px dashed #e5e5e5; padding: 11px 0; }
.news-list li:first-child { padding-top: 0; }
.news-list li h3 { font-size: 18px; line-height: 26px; font-weight: normal; color: #333; margin-bottom: 6px; }
.news-list li:hover h3 { color: #253d99; }
.news-list li .desc {
    font-size: 14px;
    line-height: 26px;
    color: #888;
    margin-bottom: 12px;
    height: 52px;
    overflow: hidden;
}
.news-list li .meta { font-size: 13px; color: #bbb; display: flex; justify-content: space-between; }
.news-list li .meta .date { color: #bbb; }
.news-list li .meta .views { color: #bbb; }

/* ==================== 案例列表页 ==================== */
.case-grid { display: flex; flex-wrap: wrap; gap: 25px; }
.case-grid .case-item {
    flex: none;
    width: calc((100% - 50px) / 3);
    border: 1px solid #eee;
    background: #fff;
    text-align: center;
    transition: box-shadow .3s;
}
.case-grid .case-item:hover { box-shadow: 0 4px 20px rgba(0,0,0,.1); }
.case-grid .case-item .pic { display: block; height: 240px; background: #eef3fa; padding: 15px; }
.case-grid .case-item .pic img { width: 100%; height: 100%; object-fit: contain; }
.case-grid .case-item .name {
    display: block;
    height: 50px;
    line-height: 50px;
    padding: 0 10px;
    font-size: 14px;
    color: #656d78;
    border-top: 1px solid #f0f0f0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.case-grid .case-item:hover .name { color: #253d99; }

/* ==================== 资质荣誉列表 ==================== */
.honor-grid { display: flex; flex-wrap: wrap; }
.honor-item {
    width: 300px;
    background: #fff;
    padding: 10px;
    text-align: center;
}
.honor-item .pic { display: block; height: 415px; }
.honor-item .pic img { width: 100%; height: 100%; object-fit: contain; transition: box-shadow .3s; }
.honor-item:hover .pic img { box-shadow: 0 4px 20px rgba(0,0,0,.16); }
.honor-item .name {
    display: block;
    margin-top: 10px;
    font-size: 14px;
    color: #656d78;
    line-height: 22px;
    height: 44px;
    overflow: hidden;
}

/* ==================== 产品/案例详情页（结构取自原站） ==================== */
.pd-head { text-align: center; padding-top: 73px; }
.pd-title {
    display: inline-block;
    font-size: 24px;
    line-height: 34px;
    font-weight: normal;
    color: #333;
    max-width: 100%;
}
.pd-underline {
    display: block;
    width: 40px;
    height: 2px;
    background: #253d99;
    margin: 8px auto 0;
}
.pd-line { height: 1px; background: #ddd; margin-top: 19px; }
.pd-gallery { text-align: center; margin-top: 35px; }
.pd-gallery img {
    width: 610px;
    height: 464px;
    object-fit: contain;
    display: inline-block;
}
.pd-tabs { margin-top: 44px; }
.pd-tabs span {
    display: inline-block;
    font-size: 16px;
    line-height: 22px;
    color: #253d99;
    border-bottom: 2px solid #253d99;
    padding-bottom: 6px;
}
.pd-content { width: 878px; max-width: 100%; margin: 10px auto 0; }
.pd-content img { width: 100%; height: auto; display: block; }

/* 上下篇 */
.prev-next { margin-top: 20px; padding-top: 18px; border-top: 1px solid #eee; font-size: 14px; color: #888; }
.prev-next p { line-height: 32px; }
.prev-next a { color: #888; }
.prev-next a:hover { color: #253d99; }

/* ==================== 联系我们 ==================== */
.contact-top { display: flex; gap: 35px; margin-bottom: 40px; padding-top: 55px; }
.contact-info {
    width: 480px;
    flex-shrink: 0;
    background: #253d99;
    color: #fff;
    padding: 35px 40px;
}
.contact-info h3 { font-size: 22px; font-weight: normal; padding-bottom: 15px; border-bottom: 1px solid rgba(255,255,255,.25); margin-bottom: 25px; }
.contact-info li {
    font-size: 14px;
    line-height: 30px;
    margin-bottom: 12px;
    word-break: break-all;
}
.contact-info li em { font-style: normal; color: #cfd8f0; }

/* 留言表单（尺寸/配色取自原站 con_42_40） */
.msg-form { flex: 1; min-width: 0; }
.msg-form h3 { font-size: 22px; font-weight: normal; color: #333; padding-bottom: 15px; border-bottom: 1px solid #eee; margin-bottom: 25px; }
.msg-form .row { margin-bottom: 12px; }
.msg-form input[type=text] {
    width: 100%;
    height: 36px;
    line-height: 22px;
    border: 1px solid #CCD1D9;
    background: #fff;
    padding: 7px 12px;
    font-size: 14px;
    color: #333;
}
.msg-form textarea {
    width: 100%;
    height: 130px;
    border: 1px solid #CCD1D9;
    background: #fff;
    padding: 8px 12px;
    font-size: 14px;
    line-height: 1.6;
    color: #333;
    resize: vertical;
}
.msg-form input[type=text]::placeholder,
.msg-form textarea::placeholder { color: #666; opacity: .5; }
.msg-form input:focus, .msg-form textarea:focus { border-color: #609EE9; }
.msg-form .code-row { display: flex; gap: 10px; align-items: flex-start; }
.msg-form .code-row input { flex: 1; }
.msg-form .code-row img {
    width: 115px;
    height: 36px;
    border: 1px solid #CCD1D9;
    padding: 2px;
    background: #fff;
    cursor: pointer;
    flex-shrink: 0;
}
.msg-form button {
    min-width: 66px;
    height: 36px;
    line-height: 36px;
    padding: 0 16px;
    background: #609EE9;
    border: 1px solid #609EE9;
    border-radius: 2px;
    color: #fff;
    cursor: pointer;
    font-size: 14px;
    transition: background .3s;
}
.msg-form button:hover { background: #5795E0; border-color: #5795E0; }

/* 分公司 */
.branch-title { font-size: 20px; font-weight: normal; color: #333; margin: 20px 0 20px; }
.branch-list { display: flex; flex-wrap: wrap; gap: 20px 30px; }
.branch-list li { width: calc((100% - 60px) / 3); font-size: 14px; line-height: 26px; color: #656d78; }
.branch-list li b { display: block; color: #333; font-weight: bold; margin-bottom: 5px; }

/* ==================== 新闻详情 ==================== */
.page-body.pt-newsdetail { padding-top: 58px; }
.news-title {
    font-size: 24px;
    font-weight: normal;
    color: #333;
    text-align: center;
    line-height: 34px;
    max-width: 800px;
    margin: 0 auto;
}
.news-meta {
    text-align: center;
    font-size: 13px;
    color: #999;
    padding: 14px 0 25px;
    max-width: 1020px;
    margin: 0 auto;
}
.news-meta span { margin: 0 12px; }
.news-article { max-width: 1020px; margin: 0 auto; }
.news-article p { line-height: 24px; margin: 0; text-indent: 0; }
.news-article span { line-height: 24px; }
.news-prev-next {
    display: flex;
    justify-content: space-between;
    max-width: 1020px;
    margin: 40px auto 0;
}
.news-prev-next p { width: 400px; font-size: 14px; line-height: 26px; }
.news-prev-next .pn-next { text-align: right; }

/* ==================== 其它 ==================== */
.pos-label { font-size: 16px; color: #656d78; margin-right: 2px; }
.empty-tip { text-align: center; color: #bbb; font-size: 15px; padding: 70px 0; }
.branch-text li { font-size: 14px; line-height: 28px; color: #656d78; }
.branch-text p { margin-bottom: 36px; text-indent: 0; font-size: 14px; line-height: 34px; color: #656d78; }
.branch-text b, .branch-text strong { color: #333; }
.branch-text em { font-style: normal; color: #999; }
.branch-text img { max-width: 100%; }

/* ==================== 页脚 ==================== */
.footer { background: #070d27; color: #999999; padding: 45px 0 0; }
.footer .f-top { display: flex; align-items: center; padding: 0 0 30px 40px; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer .f-logo { width: 225px; }
.footer .f-logo img { width: 225px; height: 60px; }
.footer .f-phone { display: flex; align-items: center; gap: 15px; margin-left: 60px; }
.footer .f-phone .ico { width: 48px; height: 48px; }
.footer .f-phone .txt .label { display: block; font-size: 14px; color: #bbbbbb; line-height: 1.2; }
.footer .f-phone .txt .num { display: block; font-size: 26px; color: #ffffff; font-weight: bold; line-height: 1.3; }
.footer .f-qr { margin-left: auto; text-align: center; }
.footer .f-qr img { width: 110px; height: 110px; display: block; }
.footer .f-qr span { display: block; margin-top: 8px; font-size: 14px; color: #aaaaaa; }

.footer .f-info { display: flex; flex-wrap: wrap; padding: 28px 0; }
.footer .f-info li {
    font-size: 14px;
    line-height: 18px;
    margin-bottom: 10px;
    color: #999999;
    white-space: nowrap;
}
.footer .f-info li:nth-child(1),
.footer .f-info li:nth-child(2) { width: 340px; }
.footer .f-info li i { display: inline-block; width: 18px; margin-right: 5px; font-style: normal; font-size: 16px; color: #999999; vertical-align: top; }

.footer .f-bottom {
    border-top: 1px solid rgba(255,255,255,.08);
    padding: 22px 0;
    text-align: center;
    font-size: 14px;
    color: #999999;
}
.footer .f-bottom p { line-height: 26px; }
.footer .f-bottom a { color: #999999; text-decoration: none; }
.footer .f-bottom a:hover { color: #fff; }

/* ==================== 响应式兜底（不影响 PC 呈现） ==================== */
@media screen and (max-width: 1240px) {
    .container { width: 100%; padding: 0 15px; }
    .banner, .banner .slide-item, .banner .slide-item a { height: 420px; }
}

/* 各区块底部间距（按原站实测逐段对齐） */
.about-section { padding-bottom: 16px; }
.case-section { padding-bottom: 13px; }
.news-section { padding-bottom: 52px; }

.product-section { padding-bottom: 93px; }